Improvement in elevators



2 Sheets-Sheetl'.

B. G. MARTIN.

ELEVATOR.

'Patented March13,1877.

the elevator-well.

Nrrnn Stra'rns Param* OFFICE- BENJAMIN MARTIN, OF NEW YORK, N. Y.

IMPROVEMENTIN ELEVATORS.

Specification forming part of Letters Patent No. 188.383, dated March 13, 1R77; application tiled November 18. 1876.

. wheel, and a shaft carrying a worm adapted to the worin-wheel for imparting motion to the drum, a reversing-gear composed of three bevelwheels, and a sliding friction-clutch, whereby the motion of elevator-drum can be reversed without interrupting or changing the motion of the driving-shaft. With the car or platform is combined a safety-clutch, which, whenever the rope breaks, is thrown in gear automatically with two cog-wheels, which mesh into racks secured to the sides of This safety-clutch also enables a person on the car or platform to lower this car or platform with any desired velocity after the rope has parted.

In the drawing, the letter A designates the elevator-drum, which is mounted on a shaft, B, and from which extends a rope, O, over a pulley to the car or platform D, which moves in the well E. 0n the shaft B is mounted a worm-wheel, b, which engages with a worm,- c, mounted on a shaft, F, that extends at right angles to the shaft B. 0n the outer end of the sha-ft F is secured a bevel-wheel, G, which meshes into two bevel-wheels, H H',v that are mounted loosely on the driving-shaft I, one on each side of the wheel G. Between the bevel-wheels H H is situated a friction-clutch, J, which is feathered on the drivin g-shaft, and which enga-ges with a lever, K, by means of which the same can be thrown in gear eitherA with the wheel H or with the wheel H.

The friction-clutch which I use for this pur- I have described in Letters Patent No. 17 9,804,

granted to me on the 11th day of July, 1876.

' form'is lowered.

The driving-shaft I receives its motion from a steam-engine or any other suitable motor, and if this motor is started said shaft revolves in one and the same direction. the friction-clutch in gear with the bevel-wheel H, theelevatordrum is caused to revolve, so as to wind up the rope C, and the platform D is raised, and by throwing the frictionclutch in gear with the wheel H the motion of the elevator-drum is reversed, and the platbe connected by suitable intermediate levers with a rope which can be reached by a person on the platform, so that said person can control the motion ofthe platform. By throwing the clutch in a central position or out of gear with both the wheels H I-I, the motion of the elevator-drum is stopped, and the platform remains stationary.

The drum A is so constructed that two ropes may be used for connecting the same with the platform D.

In order to prevent the platform or car from falling when the rope or ropes should part, I have made the following arrangement: On the sides of the well E are secured two racks, K K', which gear into cog-wheels L L, mounted on shafts M M, which have their bearin gs in standards N secured on the top of the car D, Iand which do not turn in vtheir bearings, while the wheels L L turn loosely on the same. On

these shafts are mounted friction-clutches 0 O, which are connected to them by feather keys, and which engage with forked levers P P, by the action of which they can be thrown in or out of gear with the cog-wheels L L. The

levers P P are secured to a rock-shaft, Q, which extends at right angles to the shafts M M, and has its bearings in standards B It secured to the top of the car D. On the middle of the rock-shaft Q is secured a lever, S, which extends through a standard, T, secured tothe top of the car, and which is connected to the rope C. In the standard T is situated a spring, dwhich has a tendency to depress the lever S, but by the strain of the rope the said lever is raised against the action of this spring, and the rock-shaft Q is retained in such a position that the friction-clutches O O are out of gear with the cog-wheels L L, and the car or platform D can be raised or lowered in the By throwing i The lever K is intended to.

well E without hinderance. It the rope breaks, however, the spring d depresses the lever S, the friction-clutches O O are thrown in gear with thewheels L L, and the downward motion of the car or platform is checked.

In the example shown in the drawing the lever S is made in the form of a lever-pawl, which turns loosely on the rock-shaft Q, and engages with a cog-wheel, e, that is firmly mounted on said rock-shaft. rlhe object of this arrangement is to obtain an opportunity t0 adjust the position of the lever in relation to the friction-clutches. Said lever may, however, be firmly secured on the rock-shaft, and the cogwheel e may be omitted. 0n the end 'ot' the rock-shaft Q is firmly attached a lever,

U, which extends into the interior of the car D, so that it can be conveniently reached by the person in charge.

By means of this lever the friction-clutches can be thrown in or out of gear, and in ease the rope shallpart, and the downward motion ot' the `car is stopped, the person in charge `can release the friction-clutches suflci/ently to allow the car to descend slowly. This arrangement is very desirable, particularly if the elevator is used for raising and lowering` persons to the different stories of a building.

It' the rope parts while Vthe car is midway between two stories, and no provision is made to lower the car independent ot' the rope, the persons in the car are detained until the rope is renewed or refastened.

In the example shown in the drawing l have upon the same, with the shaft F, the Worm c,

upon the same adapted to the` worm-Wheel b,

and thereversing meehanism,composed ofV the three bevel-wheels G H H', and the friction-clutch J, arranged between the wheels H H', substantially as and for the purpose described.

2. rlhe combination, with an elevator car or platform, D, its well E, and rope C, of two or more racks, K K, cog-wheels L L, frictionclutches O O, roch-shaft Q, lever S, and spring d, substantially as and for the purpose set forth.

3. rlhe combination of' thehandleverU with the rock-shaft Q, friction-clutches 0 O, cogwheels L L, racks K K, well E, and car or platform D, substantially as and for the purpose herein described.

In testimony that 1 claim the foregoing I have hereunto set my hand and seal this 17th day of November, 1876.

B. Gr. MARTIN. [L S.

Witnesses VE. F. KASTENHUBER, lion'r. E. MILLER. 

